Pole-derrick.



D. A. MANROSS.

POLE DBRRIGK.

APPLIGATION FILED mm1, 1910.

Patented Jan. 16, 1912.

DAVID A. MANROSS coLUMmA PLANOGRAIM C0.. WASHINGTON. n. c.

UNITED sTATns PATENT-onirica. I

DAVID A. MANRoss, or FRANKLIN, PENNSYLVANIA, AssIGNoR or oNI:-IIALI1 To HARRY SMITH, 0F FRANKLIN, `PENNSYLVANIA.

POLE-DERRIGK.

Specification of Letters Patent.

Application filed August 1, 1910. Serial No. 574,902.

To all whom 'it may concern:

Be it known that I, DAVID A. MANRoss, a citizen of the United States, residing at Franklin, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Pole-Derricks, of which the following is a specifica-v tion.

My invention relates to improvements in pole-derricks for use aroundoil wells, and will be fully understood by a reference to the accompanying drawings which fully illustrate the same and in which Figure 1 is an elevation of my improved pole-derrick. Fig. 2 is an elevation of the removable pulley-head of the derrick. Fig. 3 is a longitudinal section of said head.

The object of my invention is to provide a simple and inexpensive derrick which may be substituted' for the oil-well derricks usually constructed of timbers and boards.

Wooden Vderricks are not only expensive to construct on account of the increasing scarcity and consequent cost of lumber, but they are expensive to maintain on account of becoming weather-beaten, and damaged by fire and wind. In constructing my polederrick, I utilize a length of casing 1, which is," usually, about forty feet long, though it may be any other suitable metallic .mast The lower end of this is inserted into. a socket 2 positioned in close proximity to the well from which the casing 3 projects. Upon the top of the pole or mast 1 isv placedI a removable pulley-head,-Figs. 2 and 3- which is composed of a short cylindrical section, preferably of pipe or casing 4. Section 4 is enough larger `in diameter than the pole l so that when a collar 5 is placed on the upper end of said casing 1 to reinforce the same, it will just about ll the interior of said cap-section transversely. c Upon the lower end of the cap-section is placed a collar 6 for the purpose of reinforcing said cap-section 4. Through said collar andthe contiguous portfon of the cap, are placed a number of set-screws 7 which are for the Patented Jan. 16, 1912.

purpose of positioning the lower end of the y' cap concentric with the mast l, and also for securing the cap in position upon the mast.

Projecting upwardly from the cap are twol arms 8, 1n the upper end of which a pulley 9- 9 and down to the sucker-rod l2 as shown,

or to the tubing, as the case may be,- and any suitable power,--not shown-is applied to said linerll for the purpose of raising said rods or tubing from the well. rlhe derrick is also used for replacing the rods and tubing and when this is accomplished, the pole be taken down and erected at another wel If desired, however, the mast ofrmy der-` rick may be permanently erected at a well, and the `casing only may be removed and placed upon the mast similarly located at another well; in either case a derrick of low cost, ample strength and suitable elliciency is produced.

I claim:

1. A pole derrickfor use about oil wells consisting of a metallic mast, a cylindrical,

removable pulley-head therefor, a pulley carried by said head, in combination with a socket arranged approximate to a well fory receiving the base of said mast, and means for securing said mast in the upright position.

2. In a pole derrick for use about oil wells, a metallic mast, a reinforcement'at the upper end of said mast of larger diameter than the body of said mast, a cylindrical pulley-cap adapted to receive said reinforcement and the upper end of said pole or mast, In testimony whereof I affix my signature a reinforcement at th?1 lowelrl' end of said oep, in presence of two witnesses.

set-screws assin t rou(r said on rein- T s Y forcement, Ehe iner endsbof said setL-)serews y DAVID A MAB hobs' g 5 bearing against said mast, upwardly ex- Witnesses:

tending arms secured to vsaiol cap, and a pul- E. W. CRIswELL,

1 ley revolubly mounted in said arms. D. M. FLEISHMAN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C." 

